Pipefitter Valves, Fittings, and Pipe Materials 4

Question 1

A reducing tee is used in a piping system to:

Accepted Answer

Branch off a smaller pipe from a larger main line

Answer

A reducing tee has a branch outlet smaller than the main run, allowing a smaller pipe to tap into a larger header.

Question 2

Which type of pipe joint is most suitable for underground gas distribution piping?

Accepted Answer

Butt weld

Answer

Butt welding creates a continuous, leak-tight joint ideal for underground gas piping where access for maintenance is limited.

Question 3

Ductile iron pipe differs from gray cast iron pipe primarily in that it:

Accepted Answer

Has greater tensile strength and impact resistance

Answer

Ductile iron's microstructure (spheroidal graphite) gives it far greater tensile strength and toughness than brittle gray cast iron.

Question 4

A pressure relief valve on a steam boiler is set to open at:

Accepted Answer

The maximum allowable working pressure (MAWP)

Answer

Relief valves are set to open at or below the MAWP stamped on the boiler to prevent overpressure damage.

Question 5

Which fitting is used to close the end of a pipe with internal threads?

Accepted Answer

Plug

Answer

A plug has external threads and is installed into the internally threaded end of a pipe or fitting to seal it.

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